include/asm-s390/div64.h

   1 #ifndef __S390_DIV64
   2 #define __S390_DIV64
   3
   4 /* for do_div "base" needs to be smaller than 2^31-1 */
   5
   6 #define do_div(n, base) ({                                      \
   7         unsigned long long __n = (n);                           \
   8         unsigned long __r;                                      \
   9                                                                 \
  10         asm ("   slr  0,0\n"                                    \
  11              "   l    1,%1\n"                                   \
  12              "   srdl 0,1\n"                                    \
  13              "   dr   0,%2\n"                                   \
  14              "   alr  1,1\n"                                    \
  15              "   alr  0,0\n"                                    \
  16              "   lhi  2,1\n"                                    \
  17              "   n    2,%1\n"                                   \
  18              "   alr  0,2\n"                                    \
  19              "   clr  0,%2\n"                                   \
  20              "   jl   0f\n"                                     \
  21              "   slr  0,%2\n"                                   \
  22              "   ahi  1,1\n"                                    \
  23              "0: st   1,%1\n"                                   \
  24              "   l    1,4+%1\n"                                 \
  25              "   srdl 0,1\n"                                    \
  26              "   dr   0,%2\n"                                   \
  27              "   alr  1,1\n"                                    \
  28              "   alr  0,0\n"                                    \
  29              "   lhi  2,1\n"                                    \
  30              "   n    2,4+%1\n"                                 \
  31              "   alr  0,2\n"                                    \
  32              "   clr  0,%2\n"                                   \
  33              "   jl   1f\n"                                     \
  34              "   slr  0,%2\n"                                   \
  35              "   ahi  1,1\n"                                    \
  36              "1: st   1,4+%1\n"                                 \
  37              "   lr   %0,0"                                     \
  38              : "=d" (__r), "+m" (__n)                           \
  39              : "d" (base) : "0", "1", "2", "cc" );              \
  40         (n) = (__n);                                            \
  41         __r;                                                    \
  42 })
  43
  44 #endif